Neck of a glass vial



FIG. 1 is a perspective view of the top and one side of a neck of a glass vial showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a right side view of FIG. 1, the opposite left side being a mirror image thereof.

The broken lines showing the lower portion of a vial in FIGS. 2, 3 and 4 are for illustrative purposes only and do not form part of the claimed design. 

The ornamental design for a neck of a glass vial, as shown and described. 